Watson-Marlow SP40 - Manual (Page 37)

GENERAL MAINTENANCE
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7.9 Fitting options
7.9.1 Fitting a high-level float switch
1. Remove the breather cap (A).
2. Install the breather cap with high level float
switch.
3. Connect the high-level float switch to the
auxiliary power circuit via the PVC cable (2 x
0.34 mm2). Bear in mind that the electrical
contact of the float switch is normally closed
(NC). When the lubricant level is (too) high the
contact will open.
7.9.2 Fitting a low level float switch
1. Place a tray under the drain plug.
2. Remove the drain plug (C) and collect the
lubricant.
3. Install the drain plug with the low level float
switch and tighten it firmly.
4. Remove the breather cap (A) and position a
funnel in the breather.
5. Refill with lubricant until the level is half way the
inspection tube (B).
6. Install the breather cap.
7. Connect the low level float switch to the
electrical supply.
The electrical contact of the float switch is
normally closed (NC). When the lubricant level
is (too) low the contact will open.
7.9.3 Float switch power specification
A A
C
B
A
C
B
A
Specifications
Voltage Max. 230V AC/DC
Current Max. 2A
Power Max. 40VA